My current test is an iPad Pro and Apple pencil with GoodNotes. It's not inexpensive and I didn't buy the tablet specifically for this reason, but it's a test.
It's good for some things: meetings notes, proposal work, things I need to send to other people.
It is not a replacement for pen and paper. For me I like fountain pens and paper. So I still have one or two notebooks that I'm using for daily schedule, etc.